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Yep, I remembering doing an event shoot for a friend and finding out the film did not advance in the camera. Also loading the BW film in development reels and developing by hand. On my Pentax I changed film all the time but only changed batteries once a year. Now I shoot hundreds of pics on a card but change batteries.

But that grain....mmmm...that grain.

Grain is the brushstroke of photography! (I didn't think of that, a photography teacher in college said that.)